Strap fastener



Feb. 5, 1929. 1,100,992 h K. C. AUGENSTEIN STRAP FASTENER Filed May 4, 1928 d .l j yf INVENTOR.

ATTORNEYS.

Patented Feb. 5, 1929.

- UNITED STATES PATENT oFHe KARL c. AUGENS'IEIN, or cnans'ron, rmonn ISLAND, Assrcnoa'ro EDWIN r. M. i

srnrnnn, or nnenwoon, nHonn ISLAND.

STRAP FASTENER.

Application filed May 4, 1928. Serial no. 275,060.

This invention relates to an attachment for a wrist watch strap particularly adapted to attach the strap to one of the sections of an extension device; and has for its object to provlde'a removable bar of very thin construction to allow the extension device to be made of minimumthickness.

A further object of the invention is the provision of a bar for securing a wrist watch strap which may be easily placed in position and removed to adjust the strap to various positions in the device.

A still further object of the invention is to provide meansfor securing a cross bar of this character in position by splitting the bar to form two resilient arms each of which is notched to prevent longitudinal movement of the bar when in place but which may be manually compressed to permit ready removal or adjustment of thebar from one position to another.

lVith these and other'objects in view, the invention consists of certain novel features of construction, as will be more fully described, and particularly pointed out in the appended claims.

In the accompanying drawings:

Figure 1 is a top plan view of the extension device shown attached to a wrist watch with a fragment of the strap attached thereto.

Figure 2 shows the extension device in unfolded position.

Figure 3 is a perspective view of one of the sections of the device.

Figure 4 is a perspective view of the bar or pin which may be positioned in the openings provided in the member shown in Figure 3.

Figure 5 illustrates the end of the strap provided with an eye through which the bar may be passed.

Figure 6 is a sectional view showing the bar partially pushed into position through the eye in the strap.

Figure 7 shows the bar in its securing position in the strap.

It is found desirable in folding extension devices to adjust the strap to accommodate different sizes of wrists and in order to form a construction by which this may be readily accomplished I have provided openings in the side walls of one of the sections to which the strap is attached by a pin or bar split to form a pair of arms which arms are notched to receive the edgesof the openings through which the bar passes to secure the bar in place by the outward spring of the arms, which resiliency permits the arms to be moved toward each other to release the abutments on either side of the notches to allow withdrawal ofthe bar from position; and the following is a detaileddescription of the present embodiment of this invention illustrating the pro ferred forinby which these advantageous results may be accomplished:

With reference to the drawings 10 designates awrist Wat-ch provided with lugs 11 through which apin 12 is passed to secure the loop portion 13 of the extension device 14 thereto.

This extension device consists of three sections 15, 16 and 17, the last of which is provided with side walls or flanges 18 to receive between them the other two sections and also to have mounted in these side walls a flat bar 19.

. A series of openings 20 and 32 are provided along the side walls 18. of a size through which the bar 19 may be passed. This bar 19 is plit as at 21 to provide a pair of resilient arms 22 and 23 with notches 24 near their ends to snap into engagement with the edges 25 of the opening 20 through which the bar is passed. The notches 24 provide abutments and 31 to respectively engage the inner surface and outer surface of the side wall 18 to prevent longitudinal movement of the pin when in position.

Each of these arms is provided. with an enlarged end 26 which serves as a handle or finger piece by which these arms may be compressed or moved toward each other to disengage the notches 24 from the edges of the opening 20 and permit withdrawal of the bar 19 from its position.

It will be noted that the bar 19 is of suflicient length to cause its end 27 to extend through the opening 32 and slightly beyond the side wall 18 of'the section 17 when the through the opening 20 in one side wall through eye 29 and then opening 32 in the other side wall and its notches are allowed to snap into engagement with the edges of the opening 20 to securely hold the pin in position.

It will be understood that the arms when being passed through the opening 20 are compressed against their inherent resiliency to, spread and as soon as the notches register with the side wall, the resiliency causes these arms to spread outwardly as illustrated in Figure 7.

I have described this invention in its particular adaptation to an extension device but I desire it to be understood that the bar may be positioned in any aligned openings for the purposes for which it is adapted.

The foregoing description is directed solely towards the construction illustrated, but I desire it to be understood that I reserve the privilege of resorting to all the mechanical changes to which the device is susceptible, the invention being defined and limited only by the terms of the appended claims.

1. In an extension device for a watch strap, a section to which the strap with an eye in its tip may be connected having side walls with aligned openings, a cross bar of a size to extend through the eye in the tip of the strap and into the openings in said side walls,

and resilient movable means at one end of said bar to engage the edges of one of said openings to prevent endways movement of said bar, and finger portions on said resilient means for manually operating said resilient means.

2. In an extension device for a watch strap, a section to which the strap with an eye in its tip may be connected having side walls with aligned openings, a cross bar of a size to extend through the eye in the tip of the strap and into the openings in said side walls, and abutment means adjacent one end of said bar engaging the inner surface of said Side walls at the margins ofsaid openings, and means to permit said abutment means to be manually moved to disengage the said margins and pass through the opening.

3. In an attachment fora watch strap having an eye in its tip, a section having spaced portions with aligned openings, a bar split at one end to provide a pair of arms to'frictionally engage the edges of the opening through which they extend, and finger portions on the ends of said arms for compressing the arms to move them out of engagementwith the edges of said opening for removing the bar from position.

4. In an attachment for a watch strap having an eye in its tip, a section having spaced portions with aligned openings, a cross bar of a size to extend through the eye in the tip of the strap and into said openings, said bar being split to form a pair of arms, notches adjacent the end of the arms engaging the edge of the opening through which they pass to prevent longitudinal movement of the bar in either direction, said arms being compressible toward each other from the edges of said opening to permit withdrawal of the bar.

In testimony whereof I atfix my signature. I

KARL o. AUGENSTEIN.

to disengage the notches 

